<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //判断里面有多少个质数
        for (var i = 2; i <= 100; i++) {
            var sum = 0;
            for (var j = 1; j <= parseInt(i / 2); j++) {
                if (i % j === 0) {
                    sum++
                }
                if (sum > 1) { 
                    break
                }
            }
            if (sum === 1) {
                console.log(i + "是质数");
            } else {
                console.log(i + "是合数");
            }
        }
    </script>
</body>

</html>